title: Opinion section on frailty.
authors.affiliation: Columbia University, Mailman School of Public Health, New York, United States.
authors.forename: Linda P
authors.initials: LP
authors.lastname: Fried
authors.forename: Ravi
authors.initials: R
authors.lastname: Varadhan
authors.forename: Vilhelm A
authors.initials: VA
authors.lastname: Bohr
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D004198:Disease Susceptibility; D016330:Frail Elderly; D006706:Homeostasis; D006801:Humans; D008954:Models, Biological; D010641:Phenotype; D013312:Stress, Physiological; D049490:Systems Biology; D009626:Terminology as Topic